为什么不inspect.getsource返回全班源？

Question

我有这样的代码在我forms.py：

from django import forms
from formfieldset.forms import FieldsetMixin


class ContactForm(forms.Form, FieldsetMixin):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)

    fieldsets = ((u'Personal Information',
                {'fields': ('full_name', 'email', 'website'),
                'description': u'Your personal information will not ' \
                                u'be shared with 3rd parties.'}),
                (None,
                {'fields': ('message',),
                'description': u'All HTML will be stripped out.'}),
                (u'Preferences',
                {'fields': ('send_notification',)}))

当我尝试与inspect编程提取代码它留下了fieldsets：

In [1]: import inspect

In [2]: import forms

In [3]: print inspect.getsource(forms)
from django import forms
from formfieldset.forms import FieldsetMixin


class ContactForm(forms.Form, FieldsetMixin):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)

    fieldsets = ((u'Personal Information',
                {'fields': ('full_name', 'email', 'website'),
                'description': u'Your personal information will not ' \
                                u'be shared with 3rd parties.'}),
                (None,
                {'fields': ('message',),
                'description': u'All HTML will be stripped out.'}),
                (u'Preferences',
                {'fields': ('send_notification',)}))

In [4]: print inspect.getsource(forms.ContactForm)
class ContactForm(forms.Form, FieldsetMixin):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)


In [5]:      

这似乎不与空行的问题。我之间没有空行测试，我已经把额外的空白行中其他属性之间。结果并没有改变。

为什么检查任何想法是只返回fieldsets之前的部分，而不是类的整个源代码？

Answer 1

修改：订正基于评论

内部inspect.getsource(forms.ContactForm)方法BlockFinder.tokeneater()被用来确定ContactForm块停止在那里。除了别人，它会检查tokenize.DEDENT，它存放在GitHub上在您的版本的fieldsets前右认定。行只包含一个线断裂，所以inspect认为当前块已结束。

如果您插入4个空格，它再次为我工作。我不能这样做的理由，或许性能。

争论

class ContactForm(forms.Form):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)
    # <-- insert 4 spaces here
    fieldsets = ((u'Personal Information',
                {'fields': ('full_name', 'email', 'website'),
                'description': u'Your personal information will not ' \
                                u'be shared with 3rd parties.'}),
                (None,
                {'fields': ('message',),
                'description': u'All HTML will be stripped out.'}),
                (u'Preferences',
                {'fields': ('send_notification',)}))

这inspect.getsource(forms)的工作方式不同的原因是因为inspect在这种情况下没有确定类定义的开始和结束。它简单地输出整个文件。

Answer 2

我的作品。我没有在我的代码“从formfieldset.forms导入FieldsetMixin”。也许这是造成问题..